Thin-disk oscillator delivering radially polarized beams with up to 980  W of CW output power

Dietrich, Tom; Rumpel, Martin; Beirow, Frieder; Mateo, Cherry May N.; Pruß, Christof; Ahmed, Marwan Abdou; Graf, Thomas

doi:10.1364/ol.43.001371

Cited by 19 publications

(3 citation statements)

References 16 publications

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“…This VFR and modal decomposition techniques are utilized in mode distribution analysis of lasers emitting VBSs 51,68–72 and VBS converters 73–79 . Moreover, in the context that some researches 80–82 claim that multimode waveguides and fibers should be treated with exact modes, that is VBSs, instead of LP modes.…”

Section: Resultsmentioning

confidence: 99%

Comprehensive quantitative analysis of vector beam states based on vector field reconstruction

Suzuki

Yamane

Oka

et al. 2019

Sci Rep

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We demonstrate a comprehensive quantitative analysis of vector beam states (VBSs) by using a vector field reconstruction (VFR) technique integrating interferometry and imaging polarimetry, where the analysis is given by a cylindrically polarized Laguerre–Gaussian (LG) mode expansion of VBSs. From test examples of cylindrically polarized LG mode beams, we obtain the complex amplitude distributions of VBSs and perform their quantitative evaluations both in radial and azimuthal directions. The results show that we generated ( l , p ) = (1, 0) LG radially polarized state with a high purity of 98%. We also argue that the cylindrically polarized LG modal decomposition is meaningful for the detail discussion of experimental results, such as analyses of mode purities and mode contaminations. Thus the VFR technique is significant for analyses of polarization structured beams generated by lasers and converters.

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Section: Resultsmentioning

confidence: 99%

Comprehensive quantitative analysis of vector beam states based on vector field reconstruction

Suzuki

Yamane

Oka

et al. 2019

Sci Rep

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“…Due to the unique polarization and amplitude symmetric properties with highly compact configurations [1,2], narrow linewidth cylindrical vector beams (CVBs) generated from fiber lasers by intra-cavity or extra-cavity conversion have attracted increasing attention in recent years for its versatile applications, such as material processing [3,4], optical trapping and manipulation [5][6][7], high resolution imaging [8,9], and optical communication [10][11][12], and so on. Among the aforementioned applications, narrow linewidth CVBs with ever increasing performance figures are demanded, and various methods, including coherent beam combination [13,14], metasurface [15,16], grating mirror [17,18], have been proposed and demonstrated to generate high power CVBs. Among them, it is an efficient and convenient method to generate CVBs by metasurface [19,20].…”

Section: Introductionmentioning

confidence: 99%

Metasurface-generating high purity narrow linewidth cylindrical vector beams: power scaling and its limitation

Xie

Zhang

et al. 2023

Front. Phys.

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1.89 kW cylindrical vector beams (CVBs) at 1,064 nm with the 3 dB linewidth being about 0.08 nm have been generated from a narrow linewidth all-fiber linearly-polarized laser by metasurface extra-cavity conversion. At the maximum output power, the transmission efficiency, mode purity of radially polarized cylindrical vector beams (RP-CVBs) are 97% and 92.7%, respectively. To the best of our knowledge, this is the highest power of narrow linewidth CVBs generated from fiber laser. The temperature of the metasurface is moderate, and the maximum temperature is 75.5°C at 1.89 kW, which means that the system can be further power scaled. The evolution of mode purity has been analyzed numerically, and the influence of high-order modes (HOM) in laser source and thermal effects of metasurface has been calculated, which reveals that the presence of high-order modes and the temperature rise of metasurface degrade the mode purity of the CVBs. Among them, HOM causes a degradation of 1.68%, thermal lensing effect contributes 2.32%, and the microstructure variation of the metasurface contributes the remaining 3.3%.

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“…Over the past few years, GWS have repeatedly proven to be innovative devices, especially in the design of laser resonators that need to be stabilized to a defined state of polarization. In [1], a GWS served as a reflective diffraction grating that was used as the end-mirror of a resonator of a Yb:LuAG thin-disk laser. The GWS allowed linear polarization to be stabilized and, at the same time, beam pointing caused by thermally induced air convection in front of the laser disk to be passively compensated for.…”

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confidence: 99%

Design of grating waveguide structures for pulsed laser systems

Rumpel¹,

Beirow²,

Graf³

et al. 2022

PhotonicsViews

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overall laser efficiency for the generation of radially-polarized beams from a passively mode-locked thin-disk laser. In a similar way to [3], we will discuss design considerations of the GWOC, but focus mostly on the optimization of the polarization function in reflectivity and how to maximize the production yield, given known production tolerances and characteristics of the production equipment in use. We then briefly present results obtained from a commercial laser system with our GWOC (Fig. 1). The aim was the generation of laser beams with linear polarization from a passively q-switched Nd:YAG rod laser. and azimuthally polarized) laser beams. This 'grating waveguide output coupler' GWOC made it possible to realize a radially-polarized Yb:YAG thin-disk laser that was passively mode-locked. Since unwanted diffraction losses to the ±1 st order in transmission of the GWOC reduced the overall laser efficiency, improvements to its design were discussed in [3] or, alternatively, different resonator concepts based on GWS to replace the GWOC were discussed in [4]. Here, GWS were investigated that serve as a cavity end-mirror combined with a saturable absorber used as an output coupler. The aim was to increase the Source all images: MarTec Photonics

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Thin-disk oscillator delivering radially polarized beams with up to 980 W of CW output power

Cited by 19 publications

References 16 publications

Comprehensive quantitative analysis of vector beam states based on vector field reconstruction

Comprehensive quantitative analysis of vector beam states based on vector field reconstruction

Metasurface-generating high purity narrow linewidth cylindrical vector beams: power scaling and its limitation

Design of grating waveguide structures for pulsed laser systems

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